<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">
                            <!--{{this.$store.state.city}}-->
                            {{this.currentCity}}
                        </div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" v-for="item in hotCities" :key="item.id"
                         @click="handleCityClick(item.name)">
                        <div class="button">
                            {{item.name}}
                        </div>
                    </div>
                </div>
            </div>
            <div class="area" v-for="(items,key) of cities" :key="key" :ref="key">
                <div class="title border-topbottom">{{key}}</div>
                <ul class="item-list" v-for="item of items" :key="item.id">
                    <li class="item border-bottom" @click="handleCityClick(item.name)">{{item.name}}</li>
                </ul>
            </div>
        </div>
    </div>
</template>

<script>
    import Bscroll from 'better-scroll'
    import { mapState , mapMutations} from 'vuex'

    export default {
        name: "CityList",
        props: {
            hotCities: Array.isRequired,
            cities: Object.isRequired,
            letter: String.isRequired
        },
        mounted() {
            this.scroll = new Bscroll(this.$refs.wrapper)
        },
        computed: {
            ...mapState({
                currentCity: 'city'
            })
        },
        methods: {
            handleCityClick(city) {
                //  组件发布一个action
                //  this.$store.dispatch('changeCity',city)
                //  this.$store.commit('changeCity', city)
                this.changeCity(city);
                this.$router.push('/')
            },
            ...mapMutations(['changeCity'])
        },
        watch: {
            letter: {
                deep: true,
                handler: function (value) {
                    if (value) {
                        const element = this.$refs[value][0];
                        this.scroll.scrollToElement(element)
                    }
                }
            }
        }
    }
</script>

<style lang="stylus" scoped>
    @import "~styles/varibles.styl"
    .border-topbottom
        &:before
            border-color #ccc
        &:after
            border-color #ccc

    .border-bottom
        &:before
            border-color #ccc

    .list
        position absolute
        overflow hidden
        top 1.58rem
        left 0
        right 0
        bottom 0
        line-height .54rem

        .title
            line-height .44rem
            background-color #EEEEEE
            padding-left .2rem
            color #666
            font-size .26rem
        .button-list
            overflow hidden
            padding .1rem .6rem .1rem .1rem
            .button-wrapper
                float left
                width 33.33%
                .button
                    padding .1rem 0
                    text-align center
                    margin .1rem
                    border-radius .06rem
                    border .02rem solid #ccc
        .item-list
            .item
                line-height .76rem
                padding-left .2rem
</style>